I don't think this would take too long to implement. Could you pitch the idea of making things like Elise's Rappel and Summoner Heal's secondary target use self cast? By this, I mean pressing alt + E does a target-less rappel. It's a lot easier to do that than to find an empty location on the screen with your mouse.
that is an awesome idea
As awesome as this idea is, per Elise's tooltip on Rappel, it is specifically stated that,
Spider Form: Elise and her Spiderlings ascend into the air and then descend upon target enemy.
This means that she must have an enemy target, and this was done strategically. It is not meant to be a "free" escape, but rather a "strategic" escape. As for her Volatile Spiderling/Skittering Frenzy, what exactly do you mean? it's just a self-buff in spider-form and is targetless altogether! In Human form, why would you target yourself with Volatile Spiderling instead of just poking with it?
Do note that the ability can still be cast if there are no enemy targets present or in range; however, she cannot use this to freely "jump" away—she can simply go up, stay for a moment, and then drop back onto the same spot (think of it like an elevator).
